Stem احْذَرُ has 4 unique word forms and appears 4 times in the Quran.

Word Translation Occurrences
فَٱحۡذَرُواْۚ then beware 2
فَٱحۡذَرُوهُۚ so beware of Him 2
فَٱحۡذَرُوهُمۡۚ so beware of them 2
وَٱحۡذَرُواْۚ and beware 2